<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>form</title>
</head>
<body>
<form action="login" method="post">
    用户名： <input type="text" name="username">
    <br/>
    密码： <input type="password" name="pass">
    <br/>
    <button type="submit">登录</button>
</form>
</body>
</html>